Trader: Diagnostics logging - Implement file-based error logging

[konard]

📋 Issue Reference

Fixes #114

🔧 Implementation Summary

This PR implements comprehensive file-based error logging for the TraderBot application that works across all operating systems (Windows, Linux, macOS).

Changes Made

1. Added NLog Package

• Added NLog.Extensions.Logging v5.3.8 for cross-platform file logging capabilities

2. NLog Configuration (NLog.config)

• Error Logs: logs/errors-{date}.log - Captures errors and above
• All Logs: logs/all-{date}.log - Captures all log levels (Info and above)
• Console Logs: For development and debugging
• Log Rotation: 10MB max file size with automatic archiving
• Archive Retention: 7 error log archives, 3 all log archives
• Cross-platform paths: Uses ${basedir} for OS-agnostic relative paths
• Concurrency safe: Configured with concurrentWrites="true"

3. Application Updates

• Updated Program.cs to configure NLog as the logging provider
• Modified TraderBot.csproj to copy NLog.config to output directory
• Updated .gitignore to exclude logs directory from version control

🌍 Cross-Platform Compatibility

The solution works on all operating systems because:

• NLog is fully cross-platform (Windows, Linux, macOS)
• Uses OS-agnostic path patterns (${basedir})
• Automatic directory creation by NLog
• Platform-normalized path separators

📁 Log Structure

TraderBot/
├── logs/
│   ├── errors-2025-09-13.log     # Error and critical logs
│   ├── all-2025-09-13.log        # All application logs
│   └── archived/                 # Rotated log archives
│       ├── errors-1.log
│       └── all-1.log

🧪 Testing

• ✅ Project builds successfully
• ✅ NLog configuration validated
• ✅ Dependencies restored correctly
• ✅ Cross-platform file paths configured

The implementation ensures all errors are now automatically logged to files while maintaining console output for development purposes.

🤖 Generated with Claude Code